Case Discussion

Subcutaneous lesions tend to belong to a myxoid subtype and to be of younger age.

Ultrasound is helpful in determining whether the lesion is cystic or solid. The lesion can be of mixed echogenicity and sometimes the leson presents as a low-level vascular lesion on doppler ultrasound despite the intense neovascularity visible on angiography

On MRI the myxoid subtypes show

homogeneous SI comparable with normal muscle on T1

high SI on fatsat proton-density or T2 weighted images

they usually show mild to moderate enhancement, which is diffuse but slightly inhomogeneous

The increased T2 SI is most likely caused by fluid-filled mucoid spaces. Compact cellularity with a prominent capillary network and a myxoid pattern may be responsible for the enhancement on MRI.